<!DOCTYPE html>
<html lang="en">
  <head>
    <!-- AdThrive Head Tag Manual -->
    <script data-no-optimize="1" data-cfasync="false">
      (function (w, d) {
        w.adthrive = w.adthrive || {};
        w.adthrive.cmd = w.adthrive.cmd || [];
        w.adthrive.plugin = "adthrive-ads-manual";
        w.adthrive.host = "ads.adthrive.com";
        var s = d.createElement("script");
        s.async = true;
        s.referrerpolicy = "no-referrer-when-downgrade";
        s.src =
          "https://" +
          w.adthrive.host +
          "/sites/643436a4e6d20859e40a446b/ads.min.js?referrer=" +
          w.encodeURIComponent(w.location.href) +
          "&cb=" +
          (Math.floor(Math.random() * 100) + 1);
        var n = d.getElementsByTagName("script")[0];
        n.parentNode.insertBefore(s, n);
      })(window, document);
    </script>
    <!-- End of AdThrive Head Tag -->

    <!-- Global site tag (gtag.js) - Google Analytics -->

    <script
      async
      src="https://www.googletagmanager.com/gtag/js?id=UA-79254642-6"
    ></script>

    <script>
      window.dataLayer = window.dataLayer || [];
      function gtag() {
        dataLayer.push(arguments);
      }
      gtag("js", new Date());

      gtag("config", "UA-79254642-6");
    </script>

    <meta charset="utf-8" />
    <title>Heatmap &#124; the D3 Graph Gallery</title>

    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, shrink-to-fit=no"
    />
    <meta
      name="description"
      content="How to build a heatmap with Javascript and D3.js: from the most basic example to highly customized examples."
    />
    <meta
      name="keywords"
      content="Data,Dataviz,Datavisualization,Javascript,D3,D3.js,area chart"
    />
    <meta name="author" content="Yan Holtz" />
    <link rel="icon" href="img/logo/D3_single_small.png" />

    <meta
      property="og:title"
      content="Area Chart &#124; the D3 Graph Gallery"
    />
    <meta property="og:image" content="img/overview_RGG.png" />
    <meta
      property="og:description"
      content="How to build a heatmap with Javascript and D3.js: from the most basic example to highly customized examples."
    />

    <!-- Bootstrap core CSS -->
    <link href="vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet" />

    <!-- Custom fonts for this template -->
    <link
      href="vendor/font-awesome/css/font-awesome.min.css"
      rel="stylesheet"
      type="text/css"
    />
    <link
      href="https://fonts.googleapis.com/css?family=Montserrat:400,700"
      rel="stylesheet"
      type="text/css"
    />
    <link
      href="https://fonts.googleapis.com/css?family=Kaushan+Script"
      rel="stylesheet"
      type="text/css"
    />
    <link
      href="https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic,700italic"
      rel="stylesheet"
      type="text/css"
    />
    <link
      href="https://fonts.googleapis.com/css?family=Roboto+Slab:400,100,300,700"
      rel="stylesheet"
      type="text/css"
    />

    <!-- Custom styles for this template -->
    <link href="css/agency.css" rel="stylesheet" />

    <!-- JQUERY -->
    <script src="vendor/jquery/jquery.min.js"></script>

    <!-- D3.JS v4 -->
    <script src="js/d3.v4.js"></script>
    <script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script>
  </head>

  <body id="page-top">
    <!-- THIS ALLOWS TO INSERT THE MENU THAT IS STORED IN A MENU.HTML FILE-->
    <nav class="navbar navbar-expand-lg fixed-top" id="mainNav"></nav>
    <script>
      $(function () {
        $("#mainNav").load("html_chunk/menu.html");
      });
    </script>

    <!-- THIS ALLOWS TO INSERT THE MODAL OF THE MENU THAT IS STORED IN A MENU_MODAL.HTML FILE-->
    <div id="modal_menu_insertion"></div>
    <script>
      $(function () {
        $("#modal_menu_insertion").load("html_chunk/menu_modal.html");
      });
    </script>

    <!-- Header -->
    <header class="masthead" style="padding-top: 150px; padding-bottom: 80px">
      <div class="textlanding">
        <h1>Heatmap</h1>
        <hr class="short_hr" />
        <br />
        <ul class="list-inline social-buttons">
          <li class="list-inline-item">
            <a href="https://twitter.com/R_Graph_Gallery">
              <i class="fa fa-twitter"></i>
            </a>
          </li>
          <li class="list-inline-item social-buttons">
            <a href="https://github.com/holtzy">
              <i class="fa fa-github" style="color: white"></i>
            </a>
          </li>
          <li class="list-inline-item social-buttons">
            <a href="https://www.linkedin.com/in/yan-holtz-2477534a/">
              <i class="fa fa-linkedin"></i>
            </a>
          </li>
          <li class="list-inline-item social-buttons">
            <a href="https://www.yan-holtz.com">
              <i class="fa fa-home"></i>
            </a>
          </li>
        </ul>
        <br /><br />
        <p style="max-width: 700px; margin: auto">
          This is the
          <a href="https://www.data-to-viz.com/graph/heatmap.html">heatmap</a>
          section of the gallery. If you want to know more about this kind of
          chart, visit
          <a href="https://www.data-to-viz.com/graph/heatmap.html"
            >data-to-viz.com</a
          >. If you're looking for a simple way to implement it in d3.js, pick
          an example below.
        </p>
      </div>
    </header>

    <!-- THIS ALLOWS TO INSERT THE ADVERTISEMENT BANNER THAT IS STORED IN A BANNER.HTML FILE-->
    <div id="position_for_images"></div>
    <script>
      $(function () {
        $("#position_for_images").load("html_chunk/images.html");
      });
    </script>

    <!-- ======================== PORTFOLIO SECTION ============================ --><!-- Images must be 480 x 480, resize them with ./script_reformat_img.sh output_name.png -->
    <section class="bg" id="portfolio" style="padding-top: 10px">
      <div class="container">
        <div class="mySeryTitle">Step by step</div>
        <hr />
        <div id="portfolio-items" class="row">
          <div class="col-md-4 col-sm-6 portfolio-item">
            <a class="portfolio-link" href="graph/heatmap_basic.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Most basic</p>
                  <hr />
                  <p class="explanation_portfolio">
                    The most basic heatmap you can do in d3.js. Keeping only the
                    core code.
                  </p>
                </div>
              </div>
              <img class="img-fluid" src="img/graph/heatmap_basic.png" alt="" />
            </a>
          </div>
          <div class="col-md-4 col-sm-6 portfolio-item">
            <a class="portfolio-link" href="graph/heatmap_tooltip.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Add tooltip to heatmap</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Add a tooltip that displays the exact value of a cell and
                    whatever other text.
                  </p>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/graph/heatmap_tooltip.gif"
                alt=""
              />
            </a>
          </div>
          <div class="col-md-4 col-sm-6 portfolio-item">
            <a class="portfolio-link" href="graph/heatmap_style.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Ready to go heatmap</p>
                  <hr />
                  <p class="explanation_portfolio">
                    A customized heatmap, include hover effect, custom axis,
                    title, fancy color palette, tooltip and more
                  </p>
                </div>
              </div>
              <img class="img-fluid" src="img/graph/heatmap_style.png" alt="" />
            </a>
          </div>
        </div>
      </div>
    </section>

    <!-- ======================================================================= -->

    <!-- ======================== DEMO SECTION ============================ -->
    <!-- Images must be 480 x 480, resize them with ./script_reformat_img.sh output_name.png -->
    <section class="bg" id="demo" style="padding-top: 10px">
      <div class="container">
        <div class="mySeryTitle">Template</div>
        <hr />
        <p>
          The following
          <a href="https://www.data-to-viz.com/graph/heatmap.html">heatmap</a>
          is my starting <u>template</u> for my personal work. It offers most of
          the feature you need for a good heatmap: colorBrewer
          <u>colorscale</u>, <u>hover effect</u>, <u>tooltip</u>,
          <u>title</u> and custom <u>axis</u>. The
          <a
            href="https://raw.githubusercontent.com/holtzy/D3-graph-gallery/master/DATA/heatmap_data_long.csv"
            >input dataset</a
          >
          has 3 columns: row, column and value.
          <a href="graph/heatmap_style.html">Get the code here.</a>
        </p>
        <br /><br />
        <center><div id="my_dataviz"></div></center>

        <script>
          // set the dimensions and margins of the graph
          var margin = { top: 80, right: 25, bottom: 30, left: 40 },
            width = 700 - margin.left - margin.right,
            height = 700 - margin.top - margin.bottom;

          // append the svg object to the body of the page
          var svg = d3
            .select("#my_dataviz")
            .append("svg")
            .attr("width", width + margin.left + margin.right)
            .attr("height", height + margin.top + margin.bottom)
            .append("g")
            .attr(
              "transform",
              "translate(" + margin.left + "," + margin.top + ")"
            );

          //Read the data
          d3.csv(
            "https://raw.githubusercontent.com/holtzy/D3-graph-gallery/master/DATA/heatmap_data_long.csv",
            function (data) {
              // Labels of row and columns -> unique identifier of the column called 'group' and 'variable'
              var myGroups = d3
                .map(data, function (d) {
                  return d.group;
                })
                .keys();
              var myVars = d3
                .map(data, function (d) {
                  return d.variable;
                })
                .keys();

              // Build X scales and axis:
              var x = d3
                .scaleBand()
                .range([0, width])
                .domain(myGroups)
                .padding(0.05);
              svg
                .append("g")
                .style("font-size", 15)
                .attr("transform", "translate(0," + height + ")")
                .call(d3.axisBottom(x).tickSize(0))
                .select(".domain")
                .remove();

              // Build Y scales and axis:
              var y = d3
                .scaleBand()
                .range([height, 0])
                .domain(myVars)
                .padding(0.05);
              svg
                .append("g")
                .style("font-size", 15)
                .call(d3.axisLeft(y).tickSize(0))
                .select(".domain")
                .remove();

              // Build color scale
              var myColor = d3
                .scaleSequential()
                .interpolator(d3.interpolateBuPu)
                .domain([1, 400]);

              // create a tooltip
              var tooltip = d3
                .select("#my_dataviz")
                .append("div")
                .style("opacity", 0)
                .attr("class", "tooltip")
                .style("background-color", "white")
                .style("border", "solid")
                .style("border-width", "2px")
                .style("border-radius", "5px")
                .style("padding", "5px")
                .style("position", "absolute");

              // Three function that change the tooltip when user hover / move / leave a cell
              var mouseover = function (d) {
                tooltip.style("opacity", 1);
                d3.select(this).style("stroke", "black").style("opacity", 1);
              };
              var mousemove = function (d) {
                tooltip
                  .html("The exact value of<br>this cell is: " + d.value)
                  .style("left", d3.event.pageX + 20 + "px")
                  .style("top", d3.event.pageY - 30 + "px");
              };
              var mouseleave = function (d) {
                tooltip.style("opacity", 0);
                d3.select(this).style("stroke", "none").style("opacity", 0.8);
              };

              // add the squares
              svg
                .selectAll("rect")
                .data(data, function (d) {
                  return d.group + ":" + d.variable;
                })
                .enter()
                .append("rect")
                .attr("x", function (d) {
                  return x(d.group);
                })
                .attr("y", function (d) {
                  return y(d.variable);
                })
                .attr("rx", 4)
                .attr("ry", 4)
                .attr("width", x.bandwidth())
                .attr("height", y.bandwidth())
                .style("fill", function (d) {
                  return myColor(d.value);
                })
                .style("stroke-width", 4)
                .style("stroke", "none")
                .style("opacity", 0.8)
                .on("mouseover", mouseover)
                .on("mousemove", mousemove)
                .on("mouseleave", mouseleave);
            }
          );

          // Add title to graph
          svg
            .append("text")
            .attr("x", 0)
            .attr("y", -50)
            .attr("text-anchor", "left")
            .style("font-size", "22px")
            .text("A d3.js heatmap");

          // Add subtitle to graph
          svg
            .append("text")
            .attr("x", 0)
            .attr("y", -20)
            .attr("text-anchor", "left")
            .style("font-size", "14px")
            .style("fill", "grey")
            .style("max-width", 400)
            .text(
              "A short description of the take-away message of this chart."
            );
        </script>
      </div>
    </section>

    <!-- ======================================================================= -->

    <!-- ======================== INTERESTING BLOCK SECTION ============================ -->
    <!-- Images must be 480 x 480, resize them with ./script_reformat_img.sh output_name.png -->
    <section class="bg" id="portfolio" style="padding-top: 10px">
      <div class="container">
        <div class="mySeryTitle">Interesting block</div>
        <hr />
        <div id="portfolio-items" class="row">
          <div class="col-md-4 col-sm-6 portfolio-item">
            <a
              class="portfolio-link"
              href="https://bost.ocks.org/mike/miserables/"
            >
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Visualization of <i>Les Misérables</i></p>
                  <hr />
                  <p class="explanation_portfolio">
                    Interactive heatmap with possible switch in group order
                  </p>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/graph/block_heatmap_miserables.png"
                alt=""
              />
            </a>
          </div>
        </div>
      </div>
    </section>

    <!-- ============================ RELATED SECTION ============================ -->
    <section
      class="bg-light"
      id="portfolio_landing"
      style="padding-top: 30px; padding-bottom: 30px"
    >
      <div class="container">
        <p class="mySeryTitle">Related chart types</p>
        <hr />
        <div class="row">
          <div class="col-md-2 col-sm-4 portfolio-item">
            <a class="portfolio-link" href="scatter.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <i class="fa fa-plus fa-3x"></i>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/section/ScatterPlot150.png"
                alt=""
              />
            </a>
            <div class="captionPortfolio">Scatter</div>
          </div>
          <div class="col-md-2 col-sm-4 portfolio-item">
            <a class="portfolio-link" href="#heatmap">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <i class="fa fa-plus fa-3x"></i>
                </div>
              </div>
              <img class="img-fluid" src="img/section/Heatmap150.png" alt="" />
            </a>
            <div class="captionPortfolio">Heatmap</div>
          </div>
          <div class="col-md-2 col-sm-4 portfolio-item">
            <a class="portfolio-link" href="correlogram.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <i class="fa fa-plus fa-3x"></i>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/section/Correlogram150.png"
                alt=""
              />
            </a>
            <div class="captionPortfolio">Correlogram</div>
          </div>
          <div class="col-md-2 col-sm-4 portfolio-item">
            <a class="portfolio-link" href="bubble.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <i class="fa fa-plus fa-3x"></i>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/section/BubblePlot150.png"
                alt=""
              />
            </a>
            <div class="captionPortfolio">Bubble</div>
          </div>
          <div class="col-md-2 col-sm-4 portfolio-item">
            <a class="portfolio-link" href="connectedscatter.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <i class="fa fa-plus fa-3x"></i>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/section/ScatterConnected150.png"
                alt=""
              />
            </a>
            <div class="captionPortfolio">Connected scatter</div>
          </div>
          <div
            class="col-md-2 col-sm-4 portfolio-item show column correlation numonly bigdata"
          >
            <a class="portfolio-link" href="density2d.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <i class="fa fa-plus fa-3x"></i>
                </div>
              </div>
              <img
                class="img-fluid"
                src="img/section/2dDensity150.png"
                alt=""
              />
            </a>
            <div class="captionPortfolio">Density 2d</div>
          </div>
        </div>
      </div>
    </section>

    <!-- ============================ CONTACT SECTION ============================ -->

    <!-- ANCHOR -->
    <a name="contactanchor"></a>

    <section id="contact" class="bg" style="background-color: white"></section>

    <!-- THIS ALLOWS TO INSERT THE CONTACT CHUNK THAT IS STORED IN A CONTACT.HTML FILE-->
    <script>
      $(function () {
        $("#contact").load("html_chunk/contact.html");
      });
    </script>

    <!-- ============================ FOOTER SECTION ============================ -->
    <footer class="bg-light" id="myFooter"></footer>

    <!-- Start Added by AdThrive -->
    <script
      type="text/javascript"
      async
      src="https://btloader.com/tag?o=5698917485248512&upapi=true&domain=d3-graph-gallery.com"
    ></script>
    <script>
      !(function () {
        "use strict";
        var e;
        (e = document),
          (function () {
            var t, n;
            function r() {
              var t = e.createElement("script");
              (t.src =
                "https://cafemedia-com.videoplayerhub.com/galleryplayer.js"),
                e.head.appendChild(t);
            }
            function a() {
              var t = e.cookie.match("(^|[^;]+)\s*__adblocker\s*=\s*([^;]+)");
              return t && t.pop();
            }
            function c() {
              clearInterval(n);
            }
            return {
              init: function () {
                var e;
                "true" === (t = a())
                  ? r()
                  : ((e = 0),
                    (n = setInterval(function () {
                      (100 !== e && "false" !== t) || c(),
                        "true" === t && (r(), c()),
                        (t = a()),
                        e++;
                    }, 50)));
              },
            };
          })().init();
      })();
    </script>
    <!-- End Added by AdThrive -->

    <!-- THIS ALLOWS TO INSERT THE FOOTER THAT IS STORED IN A FOOTER.HTML FILE-->
    <script>
      $(function () {
        $("#myFooter").load("html_chunk/footer.html");
      });
    </script>

    <!-- ============================ -->

    <!-- =============== JAVASCRIPT SECTION =============== -->

    <!-- Bootstrap core JavaScript -->
    <script src="vendor/bootstrap/js/bootstrap.bundle.min.js"></script>

    <!-- Plugin JavaScript -->
    <script src="vendor/jquery-easing/jquery.easing.min.js"></script>

    <!-- Contact form JavaScript -->
    <script src="js/jqBootstrapValidation.js"></script>
    <script src="js/contact_me.js"></script>

    <!-- Custom scripts for this template -->
    <script src="js/agency.min.js"></script>

    <!-- Activate the bootstrap tooltip, must be after jQuery load -->
    <script>
      $(function () {
        $('[data-toggle="tooltip"]').tooltip();
      });
    </script>

    <!--============================== -->
  </body>
</html>
